v3.25.2
Segment reporting - Reconciliation of information on reportable segments to the amounts reported in the financial statements (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
 [1]
Geographical information          
Segment Adjusted EBITDA $ 277.3 $ 287.2 $ 563.7 $ 499.7  
Finance costs (114.3) (279.2) (228.7) (1,812.7)  
Depreciation and amortization (89.0) (87.2) (178.4) (174.7)  
Share-based payment expense (8.5) (4.9) (14.0) (8.1)  
Other costs (5.5) (3.8) (8.6) (6.4)  
Net impairment of property, plant and equipment, intangible assets excluding goodwill and related prepaid land rent (1.7) (2.9) (3.6) (6.0)  
Business combination costs (0.3) (0.1) (1.2) (0.3)  
Insurance claims 0.2 0.1 0.3    
Net gain on disposal of property, plant and equipment and right-of-use assets 2.2 1.9 1.0 2.3  
Net reversal of impairment/(impairment) of withholding tax receivables 0.5 (2.8) 12.9 (10.9)  
Finance income 35.6 43.0 56.1 24.3  
Impairment of assets held for sale   (2.9)   (2.9)  
Impairment of goodwill       (87.9)  
Unallocated corporate expenses (28.8) (36.4) (62.7) (63.7)  
Net gain on disposal of property, plant and equipment and right-of-use assets (2.2) (1.9) (1.0) (2.3)  
Income/(loss) before income tax 67.7 (88.0) 136.8 (1,647.3)  
Segment assets 4,489.8   4,489.8   $ 4,246.5
Segment liabilities 4,588.2   4,588.2   $ 4,560.9
Costs related to internal reorganization 1.2 1.3 1.7 1.8  
Expenses related to strategic initiatives and operating systems 2.8 2.5 4.5 4.5  
Professional costs related to financing 0.3   0.3 0.0  
Cost of sales          
Geographical information          
Net impairment of property, plant and equipment, intangible assets excluding goodwill and related prepaid land rent (1.7) (2.9) (3.6) (6.0)  
Impairment of assets held for sale   (2.9)   (2.9)  
SSA          
Geographical information          
Segment Adjusted EBITDA 73.1 76.4 144.8 146.1  
Segment assets 1,380.5 1,331.0 1,380.5 1,331.0  
Segment liabilities $ 882.9 892.6 $ 882.9 892.6  
MENA          
Geographical information          
Segment Adjusted EBITDA   6.1   12.2  
Segment assets   174.6   174.6  
Segment liabilities   $ 101.7   $ 101.7  
[1] Revised for corrections to Property, plant and equipment and Trade and other payables (see note 21).